Existence, multiplicity and stability of endemic states for an age-structured S-I epidemic model

Mathematics – Analysis of PDEs

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changed content, i.e. added well-posedness, stability change and Hopf bifurcation

Scientific paper

We study an S--I type epidemic model in an age-structured population, with mortality due to the disease. A threshold quantity is found that controls the stability of the disease-free equilibrium and guarantees the existence of an endemic equilibrium. We obtain conditions on the age-dependence of the susceptibility to infection that imply the uniqueness of the endemic equilibrium. An example with two endemic equilibria is shown. Finally, we analyse numerically how the stability of the endemic equilibrium is affected by extra-mortality and by the possible periodicities induced by the demographic age-structure.

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